I didn't know that. I usually have YJ nests near my front door. They dive bomb visitors, but don't bother me, even if I'm shooshing one out of my kitchen. Came almost nose to nose with a nest this am when trimming clematis. I don't know why they don't bother me, but if they kill bees, I will (with some remorse) start offing them.
OK, this is weird but they don't bother me either. No kidding. They'll do a buzz run now and then but I have never stung.
Not sure how far I'd care to press that, though. I have taken down "dead" nests that turned out not to be (you want to remember which ones you nuked the day before better than I seem to) and so far no problem. But I still do a pretty hasty retreat.
I mean never BEEN stung. LOL! I’ve never stung them either.